It seems like youre mentioning a set of Masonic regalia items. Masonic regalia are ceremonial clothing and accessories worn by members of Freemasonry, a fraternal organization with a long history and various symbolic rituals. In this case, youre referring to a set of 12 pieces of Masonic regalia specifically for a Master Mason in a Blue Lodge. The Blue Lodge is the foundational lodge of Freemasonry where the basic degrees are conferred. The regalia includes a chain collar, which is a decorative piece worn around the neck. Master Masons often wear regalia to signify their rank and membership within the organization. Each piece of regalia may have symbolic significance within the context of Masonic rituals and teachings. The number "12" likely refers to the quantity of these collar sets in the package.